Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aba41b7e88e78aa…

MALICIOUS

PDF

94.1 KB Created: 2021-08-01 21:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3add9db51cc7a7f0fec3c5bd940d88f5 SHA-1: 807a6cc27eabc9cbde4075cbfbe31d622366e5fd SHA-256: 0aba41b7e88e78aa2b3bebf7589e48b2fa0a3724580f05b149d79cd1e54d18b8
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb13812814b---5620850350.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/setilanelasadu.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/29597024241.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/85291394064.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/82660666632.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/er88jqt3uia99lh3mlc6ismjkt/71015341897.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xojijafo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/37139806810.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986ddc45b4---92325580951.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/levjol4gk11d253ssq14dh9en6/58452365506.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f33c74391aa7510975150d9087e23f74/riwariseto.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C978E2951F8.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217997c433---99669222076.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/dopopawaxugigojapidalizew.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3187abf993---bidapadinosu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ig673klf1lrvk4lresc9u41prj/rozaxeja.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f27ac28db226a835c1243fc29315f556/69224790358.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f31324888b8a98a366adfc1e225317cd/kofajotudimem.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c04d03ef156c2251a116a2987b499551/24504052004.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/poperolobedomasesifirosis.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/92814426841.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94eea34f9---3893174709.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae164664d2---gudogexediguwave.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a4a45b72---48032774607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sukanya+samriddhi+yojana+calculator+state+bank+of+indiaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 11392 bytes
SHA-256: 9b2e2d0e3e32d9a1a6858330f7c7701f2b642faf0ebc33149a973739c5208571
font_01_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 17316 bytes
SHA-256: 1bb0110d3223026188d3f95f07dd807abf2008fa8e5eaf881d32378847394a7e
font_02_sfnt_off000151c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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